package com.atguigu.gmall.realtime.app.dwd.db;

import com.atguigu.gmall.realtime.utils.KafkaUtil;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;

/**
 * @author Felix
 * @date 2023/8/3
 * 加购事实表准备
 */
public class DwdTradeCartAdd {
    public static void main(String[] args) {
        //TODO 1.基本环境准备
        //1.1 指定流处理环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        //1.2 设置并行度
        env.setParallelism(4);
        //1.3 指定表执行环境
        StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env);
        //TODO 2.检查点相关的设置(略)
        //TODO 3.从kafka的topic_db主题中读取数据 并创建动态表
        tableEnv.executeSql(KafkaUtil.getTopicDbDDL("dwd_trade_cart_group"));
        //TODO 4.过滤出加购行为
        Table cartTable = tableEnv.sqlQuery("select\n" +
            "\t`data`['id'] id,\n" +
            "\t`data`['user_id'] user_id,\n" +
            "\t`data`['sku_id'] sku_id,\n" +
            "\tif(`type`='insert',`data`['sku_num'],CAST((CAST(`data`['sku_num'] AS INT) - CAST(`old`['sku_num'] AS INT)) AS string)) sku_num,\n" +
            "\tts\n" +
            "from topic_db where `table`='cart_info' and (`type`='insert' \n" +
            "or (`type`='update' and `old`['sku_num'] is not null \n" +
            "and (CAST(`data`['sku_num'] AS INT) > CAST(`old`['sku_num'] AS INT))))");
        tableEnv.createTemporaryView("cart_table",cartTable);
        // tableEnv.executeSql("select * from cart_table").print();
        //TODO 5.将加购数据写到kafka主题
        //5.1 创建动态表和要写入的主题进行映射
        tableEnv.executeSql("CREATE TABLE res_table (\n" +
            "  id string,\n" +
            "  user_id string,\n" +
            "  sku_id string,\n" +
            "  sku_num string,\n" +
            "  ts string,\n" +
            "  PRIMARY KEY (id) NOT ENFORCED\n" +
            ")" + KafkaUtil.getUpsertKafkaDDL("dwd_trade_cart_add"));
        //5.2 写入
        tableEnv.executeSql("insert into res_table select * from cart_table");
    }
}
